Frederic Dalpe of J, Missisquoi, Quebec

I am looking for the parents, siblings and wife of Frederic Dalpe born 1847. In the 1901 Census Frederic and family was living in J, Missisquoi, Quebec with the R. H. Crothers family. I am also interested in why the marriage record for Helena list Margaret Sweeney in 1904 as mother andthe 1911 marriage record for Vital Marguerite Roy is listed as mother.